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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: May 2009 Posts: 45 Apprentice | | Apprentice Joined: May 2009 Posts: 45 | ok. since I just bought this truck and have no knowlegde of the differences of each part, I am goint to ask a stupid question, whats the difference between a high and low tunnel on these cabs( can I tell by hight of rise on the tunnel in inches). I want to order sound deadner and carpet pretty soon, so I figure I would consult the experts, thanks in advance | | | | | Joined: Sep 2006 Posts: 841 Shop Shark | | Shop Shark Joined: Sep 2006 Posts: 841 | i am no expert. the high hump came with the 4 speed and is more square, the low hump was on 3 speeds and autos and is rounder. | | | | | Joined: Sep 2006 Posts: 841 Shop Shark | | Shop Shark Joined: Sep 2006 Posts: 841 | a high hump should have a factory hole for the floor shifter. you can cut a hole in a low hump but it has to be bumped out a bit. that's if you are lookin to tell the difference. good luck, hr | | | | | Joined: Mar 2009 Posts: 788 'Bolter | | 'Bolter Joined: Mar 2009 Posts: 788 | the othwer big difference is that one can take the h/hump out (removable). you can always install a high hump, but you need some of the accompaning sheet metal. will give you clearance also if you run a later model A/T
ron | | | | | Joined: Mar 2004 Posts: 77 'Bolter | | 'Bolter Joined: Mar 2004 Posts: 77 | Hi,
Found this in archives.
Does anyone have a pic of high and low floor humps as used in 60-66 trucks?
The one I got with my 61 C30 Panel is not original piece.
It's about 3" tall at front, sort of square, no holes for shifter or E-brake. (but rotted at sides where it bolts to floor, so I have to figure out where to look for another.)
Thanks
Pete | | | | | Joined: Nov 2004 Posts: 1,552 Shop Shark | | Shop Shark Joined: Nov 2004 Posts: 1,552 | We have them in stock, if you still need one. | | | | | Joined: Apr 2010 Posts: 436 'Bolter | | 'Bolter Joined: Apr 2010 Posts: 436 | the othwer big difference is that one can take the h/hump out (removable). you can always install a high hump, but you need some of the accompaning sheet metal. will give you clearance also if you run a later model A/T
ron I had the low hump on my 63 C10. I was able to put a TH-400 in without any clearance problems. I don't know about anything later. My 62 C10 has the high hump. It is required for the 4-speed. | | | | | Joined: Mar 2009 Posts: 788 'Bolter | | 'Bolter Joined: Mar 2009 Posts: 788 | there is also a high hump with no shifter holes at all that is removable. it comes from the 60-62 gmc that utilized the old hydramatic trans. if any requires a pic just ask
ron | | | | | Joined: Mar 2004 Posts: 77 'Bolter | | 'Bolter Joined: Mar 2004 Posts: 77 | Thanks guys.
Now I know for sure what they look like and where to look for one.
60-62 GMC with hydramatic?
Oh boy, not exactly the easiest thing to turn up!
Pete | | |
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